Date: Fri, 23 Aug 2002 07:15:53 +0200 From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: "Un, SungKyong" <skun@etri.re.kr> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: userland malloc() and zeroed page allocation in Kernel Message-ID: <16196.1030079753@critter.freebsd.dk> In-Reply-To: Your message of "Fri, 23 Aug 2002 11:09:07 %2B0900." <001601c24a4a$121fbb60$1bf2fe81@etri.re.kr>
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In message <001601c24a4a$121fbb60$1bf2fe81@etri.re.kr>, "Un, SungKyong" writes:
>But when I try to test this, something strange happed.
>
> for (i=0; i<200;i++) {
> malloc(1MB);
> check it's all zeroed;
> set this block to 'X';
> }
> free all allocated memory(200MB);
> for (i=0; i<200;i++) {
> malloc(1MB);
> check it's all 'X';
> }
You cannot trust the value of memory you have free(3)'ed to stay
until you malloc(3) again.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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